The dishwasher (1) of the invention comprises a washing tub (2) in which the items to be washed are placed, a chamber (3) provided in the lower portion of the washing tub (2), where water in the washing tub (2) is collected during washing, and a hollow cylindrical shaped microfilter (4) provided in the middle of the chamber (3), retaining dirt carried by water passing from the chamber (3) to the water circulation or discharge line.